package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
       /*String str="好好学习java";
        StringBuilder builder=new StringBuilder(str);

        builder.append(",为了找个好工作");//在末尾追加
        System.out.println(builder);

        builder.replace(9,16,"就是为了改变世界");//替换部分，含头不含尾
        System.out.println(builder);

        builder.delete(0,8);//删除下标为0到7
        System.out.println(builder);

        builder.insert(0,"活着"); //在下标0的位置插入活着
        System.out.println(builder);*/
        StringBuilder builder=new StringBuilder("a");
        for (int i=0;i<1000000;i++){
            builder.append("a");
        }
        System.out.println("执行完毕");
    }
}
